Amazon.com is now shipping LG's new 55EG9600 curved 55" 4K OLED TV (2015 model). LG did not yet actually officially launch this TV in the US, but it's already shipping from Amazon. The price is $5,499 (and Amazon says that they currently have only 4 in stock).
The EG9600 OLED TV series offer curved display, 4K resolution, LG's new anti-glare filter, LG's WebOS 2.0 Smart TV OS and quad-core CPUs.
LG's 2014-model 55" curved Full-HD OLED TV, the 55EC9300 is currently selling for less than $2,200 at some online retailers. This means that you are paying 2.5X for adding the 4K option (of course there are more enhancement in the 2015 models, such as a new SmartTV OS version, but that's the main one in this TV). It's likely that LG will lower prices soon for their new OLED TVs.